Kramund, I've re-created Blood Eaglz's batch files as an Automator script app.
http://forboden.com/coding/FLVIvewDemux4OSX.zip
Just drag the mp4 files you want to convert onto the FLVIvewDemux4OSX.app file.
It will create a new directory called 'demuxed' inside the folder of the original files with the new converted files. (i hope that makes sense)